风流增强作用对城市地下物流通道液氮灭火效能提升研究  

Research on optimizing liquid nitrogen fire extinguishing efficiency in urban underground logistics systems through enhanced longitudinal ventilation

作　　者：宁赵玉 袁狄平 张国维[1,2] 徐敦彬 Ning Zhaoyu;Yuan Diping;Zhang Guowei;Xu Dunbin(School of Safety Engineering,China University of Mining and Technology,Jiangsu Xuzhou 221116,China;Shenzhen Research Institute,China University of Mining and Technology,Guangdong Shenzhen 518000,China;State Grid Jiangsu Electric Power Company Xuzhou Power Supply Company,Jiangsu Xuzhou 221005,China)

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]中国矿业大学深圳研究院,广东深圳518000 [3]国网江苏省电力有限公司徐州供电分公司,江苏徐州221005

出　　处：《消防科学与技术》2024年第9期1328-1334,共7页Fire Science and Technology

基　　金：江苏省自然科学基金面上资助项目(BK20221548);深圳市科创委2022年度基础研究专项面上项目(JCYJ20220530164601004)。

摘　　要：狭长受限空间中常用的灭火系统在地下物流通道中存在限制,难以直接应用。为了探究风流增强作用对液氮灭火效能的影响,文章通过改变风速和注氮位置,对不同工况下地下物流通道氧气浓度与顶棚温度的变化进行分析。结果表明,注氮能够有效扑灭地下物流通道火灾,风流增强显著提升了液氮的灭火效能,注氮距离为50 m时,风流2 m/s工况的灭火效率较风流0 m/s工况提高了41.86%。同时,在固定的注氮距离下,增强风流后火源附近的温度和氧气体积分数下降的时间明显提前。此外,当注氮距离增加时,火源附近温度和氧气体积分数下降时间均推迟,但风流增强能够减少由于注氮距离较远导致的降温和窒息效果的滞后。该研究成果对于城市地下物流系统灭火研究提供了重要的理论依据。Fire suppression systems commonly used in narrow and confined spaces have limitations when applied in urban underground logistics systems,making them difficult to implement directly.To investigate the improvement in liquid nitrogen extin⁃guishing efficiency under the influence of enhanced longitudinal ventilation in urban underground logistics systems,this study ana⁃lyzes the changes in oxygen volume fraction and ceiling tempera⁃ture under different working conditions by varying wind speed and nitrogen injection position.The results indicate that nitrogen injection can effectively extinguish fires in underground logistics tun⁃nels,and enhanced longitudinal ventilation significantly improves the extinguishing efficiency of liquid nitrogen.When the nitrogen injection distance is 50 m,the extinguishing efficiency under a wind speed condition of 2 m/s is increased by 41.86%compared to a wind speed condition of 0 m/s.Additionally,at a fixed nitro⁃gen injection distance,enhanced longitudinal ventilation significantly advances the time when the temperature and oxygen volume fraction near the fire source begin to decline.Moreover,as the nitrogen injection distance increases,the time for the tempera⁃ture and oxygen volume fraction near the fire source to decline is delayed;however,enhanced longitudinal ventilation can mitigate the lag in cooling and asphyxiation effects caused by the increased injection distance.These findings provide important theoretical support for fire suppression research in urban underground logis⁃tics systems.

关 键 词：地下火灾 地下物流通道 液氮灭火 风流增强 

分 类 号：X932[环境科学与工程—安全科学] TU998.1[建筑科学—市政工程]